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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0047a385587bd1092e4d8ceee6b7918581dde16769d5f7ce57764b3adf5f30c' 
  AND token = '5ag685mkWO0gZ5AGCtkj/sshLFOEM11KQEGxr5zbN9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}